CN109120013B - Method and device for detecting injection disturbance quantity of power grid adaptability detection device - Google Patents
Method and device for detecting injection disturbance quantity of power grid adaptability detection device Download PDFInfo
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Abstract
The embodiment of the application discloses a method and a device for injecting disturbance quantity into a power grid adaptability detection device. The technical scheme that this application embodiment shows decomposes target disturbance volume into three-phase symmetry sinusoidal alternating current signal, and the calculation obtains voltage amplitude and frequency given, and actual measurement three-phase voltage information decomposes into three-phase symmetry sinusoidal alternating current signal, and the calculation obtains voltage amplitude and frequency feedback signal, is regarded as the input of disturbance volume controller respectively, realizes the independent closed-loop control of each disturbance volume, has improved testing platform's output precision to improve the degree of accuracy that is tested by the testing device adaptability.
Description
Technical Field
The invention relates to the field of electrical equipment, in particular to a method and a device for detecting injection disturbance quantity of a power grid adaptability detection device.
Background
In the face of the increasing exhaustion of natural resources and the increasing of electricity load, the vigorous development of clean energy is an important development direction for coping with the shortage of energy and guaranteeing the energy supply in the current international society.
According to statistics, the installed capacities of photovoltaic power and wind power in China reach 1.64 hundred million kilowatts and 1.3 hundred million kilowatts respectively by the end of 2017. The new energy becomes the second largest power supply of many provincial power grids, even the installed ratio of the new energy of some provincial power grids exceeds 40%, and it can be said that the large-scale and high-proportion new energy becomes an important characteristic of a new generation of electric power system in China.
Due to the fact that instability and fluctuation of solar energy and wind energy are large, active power output of the wind power generator and the photovoltaic generator set fluctuates randomly. Such fluctuations are disturbances to conventional thermal power generating units on the line and may cause low frequency oscillations, and in addition, such active fluctuations cause reactive loss variations along the line, resulting in system voltage fluctuations that are difficult to control.
The large-scale and high-proportion new energy is accessed into the power grid, so that the regulation capacity and the disturbance resistance of the power grid are continuously reduced, and the stable risk of the power grid is continuously increased. The method provides a new challenge for safe and reliable operation of a power grid in the face of continuous increase of grid-connected capacity of wind power and photovoltaic units, and how to know operation grid-connected characteristics of the photovoltaic and photovoltaic units is an urgent problem faced by the current power operation dispatching department.
The protection threshold set by the power electronic equipment of the photovoltaic and wind turbine generator set is sensitive, and under certain conditions, when disturbance occurs to a power grid, if a large-capacity photovoltaic and wind turbine generator set is disconnected, system oscillation accidents can be caused, and the safety and reliability of operation of the power grid are not good.
Therefore, the adaptability of the power grid of the photovoltaic and wind generating set is detected through the adaptability detection device; the detection device shown in the prior art cannot truly reflect the power grid adaptability of photovoltaic and wind generating sets.
Disclosure of Invention
The invention aims to provide a method and a device for detecting the injection disturbance quantity of a power grid adaptability detection device, so as to solve the technical problem that the detection device shown in the prior art cannot truly reflect the power grid adaptability of a photovoltaic wind generating set.
A first aspect of an embodiment of the present application shows a method for detecting an injection disturbance amount of a device for power grid adaptability, where the method includes:
obtaining parameters and determining a target disturbance mode;
inputting given parameters according to a target disturbance mode, and calculating to obtain three-phase voltage amplitude and frequency given signals;
collecting three-phase output voltage, calculating the amplitude and frequency of the three-phase voltage, and generating a feedback signal;
inputting a given signal and a feedback signal into a disturbance quantity controller for regulation to obtain an output voltage command signal;
and comparing the voltage command signal with the triangular carrier, outputting to obtain a PWM control signal, and controlling the IGBT to be switched on and off according to the PWM signal.
Optionally:
there are three disturbance modes:
mode 1 is voltage ramp up, ramp down, ripple, flicker and frequency ripple;
the mode 2 is that three-phase voltage is unbalanced;
mode 3 is a harmonic injection mode.
The mode 1 is used for indicating input voltage amplitude and frequency given parameters, and other parameters are input inefficiently;
the mode 2 is used for indicating input of three-phase voltage unbalance given parameters, and input of other parameters is invalid;
the mode 3 is used for indicating the input harmonic order and the corresponding harmonic content parameter, and other parameters are input in an invalid mode.
Alternatively, when the mode is mode 2, the step of calculating the magnitudes of the three-phase voltages includes:
carrying out Park coordinate transformation on the three-phase output voltage to obtain a positive sequence direct current voltage component and a negative sequence 2 frequency multiplication alternating current voltage component;
filtering the voltage component after coordinate transformation through a 2-frequency multiplication notch filter to obtain a positive sequence direct current voltage component;
carrying out reverse Park conversion on the positive sequence direct current voltage component to obtain a three-phase positive sequence alternating current voltage component;
subtracting the three-phase positive sequence voltage component from the three-phase output voltage to obtain a three-phase negative sequence voltage component;
the magnitudes of the positive sequence voltage and the negative sequence voltage are calculated, respectively.
Optionally, the input harmonic order and the corresponding harmonic content parameter are specifically:
the harmonic order and the percentage parameter of the corresponding harmonic to the fundamental wave are input.
Optionally, the voltage command information includes: amplitude is combined with frequency.
A second aspect of the embodiments of the present application shows an apparatus for detecting an injection disturbance amount of a device for power grid adaptability, where the apparatus includes:
the acquisition unit is used for acquiring parameters and determining a target disturbance mode;
the calculation unit is used for inputting given parameters according to the target disturbance mode and calculating to obtain given signals of three-phase voltage amplitude and frequency;
the generating unit is used for acquiring three-phase output voltage, calculating the amplitude and frequency of the three-phase voltage and generating a feedback signal;
the input unit is used for inputting a given signal and a feedback signal into the disturbance quantity controller to be regulated to obtain an output voltage command signal;
and the control unit is used for comparing the voltage command signal with the triangular carrier wave, outputting to obtain a PWM control signal, and controlling the IGBT to be switched on and off according to the PWM signal.
According to the technical scheme, the embodiment of the application shows a method and a device for injecting disturbance quantity into a power grid adaptability detection device, wherein the method comprises the following steps: obtaining parameters and determining a target disturbance mode; inputting given parameters according to a target disturbance mode, and calculating to obtain three-phase voltage amplitude and frequency given signals; collecting three-phase output voltage, calculating the amplitude and frequency of the three-phase voltage, and generating a feedback signal; inputting a given signal and a feedback signal into a disturbance quantity controller for regulation to obtain an output voltage command signal; and comparing the voltage command signal with the triangular carrier, outputting to obtain a PWM control signal, and controlling the IGBT to be switched on and off according to the PWM signal. There are three disturbance modes: mode 1 is voltage ramp up, ramp down, ripple, flicker and frequency ripple; the mode 2 is that three-phase voltage is unbalanced; mode 3 is a harmonic injection mode. The mode 1 is used for indicating input voltage amplitude and frequency given parameters, and other parameters are input inefficiently; the mode 2 is used for indicating input of three-phase voltage unbalance given parameters, and input of other parameters is invalid; the mode 3 is used for indicating the input harmonic order and the corresponding harmonic content parameter, and other parameters are input in an invalid mode. The embodiment of the application discloses a method and a device for injecting disturbance quantity into a power grid adaptability detection device. According to the technical scheme shown in the embodiment of the application, the target disturbance quantity is decomposed into three-phase symmetrical sinusoidal alternating-current signals, and voltage amplitude and given frequency (feedback signals) are obtained through calculation; the actually measured three-phase voltage information is decomposed into three-phase symmetrical sine alternating current signals, voltage amplitude and frequency feedback signals are obtained through calculation and are respectively used as the input of the disturbance quantity controller, independent closed-loop control of each disturbance quantity is achieved, the output precision of the detection platform is improved, and therefore the accuracy of the adaptability test of the detected device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flowchart illustrating a method for platform injection disturbance variable for grid adaptive detection device injection disturbance variable;
FIG. 2 is a control block diagram of voltage fluctuation and flicker in mode 1 of the embodiment of the present invention;
FIG. 3 is a block diagram of positive and negative sequence separation control employed in mode 2 in an embodiment of the present invention;
FIG. 4 is a control block diagram of mode 2 in an embodiment of the present invention;
FIG. 5 is a control block diagram of mode 3 in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A first aspect of an embodiment of the present application shows a method for detecting an injection disturbance amount of a device for power grid adaptability, where the method includes:
obtaining parameters and determining a target disturbance mode;
inputting given parameters according to a target disturbance mode, and calculating to obtain three-phase voltage amplitude and frequency given signals;
collecting three-phase output voltage, calculating the amplitude and frequency of the three-phase voltage, and generating a feedback signal;
inputting a given signal and a feedback signal into a disturbance quantity controller for regulation to obtain an output voltage command signal;
and comparing the voltage command signal with the triangular carrier, outputting to obtain a PWM control signal, and controlling the IGBT to be switched on and off according to the PWM signal.
Optionally:
there are three disturbance modes:
mode 1 is voltage ramp up, ramp down, ripple, flicker and frequency ripple;
the mode 2 is that three-phase voltage is unbalanced;
mode 3 is a harmonic injection mode.
The mode 1 is used for indicating input voltage amplitude and frequency given parameters, and other parameters are input inefficiently;
the mode 2 is used for indicating input of three-phase voltage unbalance given parameters, and input of other parameters is invalid;
the mode 3 is used for indicating the input harmonic order and the corresponding harmonic content parameter, and other parameters are input in an invalid mode.
Alternatively, when the mode is mode 2, the step of calculating the magnitudes of the three-phase voltages includes:
carrying out Park coordinate transformation on the three-phase output voltage to obtain a positive sequence direct current voltage component and a negative sequence 2 frequency multiplication alternating current voltage component;
filtering the voltage component after coordinate transformation through a 2-frequency multiplication notch filter to obtain a positive sequence direct current voltage component;
carrying out inverse Park conversion on the positive sequence direct current voltage component to obtain a three-phase positive sequence alternating current voltage component;
subtracting the three-phase positive sequence voltage component from the three-phase output voltage to obtain a three-phase negative sequence voltage component;
the magnitudes of the positive sequence voltage and the negative sequence voltage are calculated, respectively.
Optionally, the input harmonic order and the corresponding harmonic content parameter are specifically:
and inputting the harmonic order and the percentage parameter of the corresponding harmonic to the fundamental wave.
Optionally, the voltage command information includes: amplitude is combined with frequency.
A second aspect of the embodiments of the present application shows an apparatus for detecting an injection disturbance amount of a device for power grid adaptability, where the apparatus includes:
the acquisition unit is used for acquiring parameters and determining a target disturbance mode;
the calculation unit is used for inputting given parameters according to the target disturbance mode and calculating to obtain given signals of three-phase voltage amplitude and frequency;
the generating unit is used for acquiring three-phase output voltage, calculating the amplitude and frequency of the three-phase voltage and generating a feedback signal;
the input unit is used for inputting a given signal and a feedback signal into the disturbance quantity controller to be regulated to obtain an output voltage command signal;
and the control unit is used for comparing the voltage command signal with the triangular carrier wave, outputting to obtain a PWM control signal, and controlling the IGBT to be switched on and off according to the PWM signal.
Specifically, fig. 1 is a specific implementation step of a method for injecting a disturbance amount into a power grid adaptive detection device according to an embodiment of the present invention, and according to fig. 1, the method for injecting the disturbance amount includes:
inputting a detection platform disturbance mode selection parameter;
acquiring a disturbance mode input parameter of a detection platform, and determining a target disturbance mode, namely judging whether the input disturbance mode is a mode 1, a mode 2 or a mode 3;
and inputting parameters. If the mode is 1, inputting voltage amplitude and frequency given parameters;
if the voltage signal is in the mode 2, inputting three-phase voltage unbalance parameters, decomposing and calculating to obtain given positive sequence and negative sequence voltage amplitudes of the three-phase voltage signals;
if the mode is 3, inputting harmonic orders and corresponding harmonic content parameters, and calculating voltage amplitude given values of the orders;
collecting three-phase output voltage of a detection platform, and calculating information such as amplitude, frequency and the like of the three-phase voltage as feedback signals;
inputting different given signals and feedback signals into a PI (proportional integral) controller respectively to be regulated to obtain output voltage instruction information, and synthesizing to obtain an output voltage instruction;
the output three-phase voltage command signal is used as a Modulation signal to be compared with a triangular carrier, a PWM (Pulse Width Modulation) control signal is output, and the detection device controls the on and off of an IGBT (Insulated Gate Bipolar transistor) according to the PWM signal, so that the following of the output voltage to a fixed signal is realized.
As one mode in this embodiment, a detailed implementation of the voltage fluctuation and flicker when selecting mode 1 is described below:
firstly, inputting a detection platform disturbance mode selection parameter as 1;
second, the parameters, voltage amplitude parameters A0, A1, and ω are input1Then the target disturbance value voltage amplitude is given as
Thirdly, collecting the three-phase output voltage of the detection platform, and calculating to obtain a three-phase voltage amplitude UrAs feedback;
fourthly, inputting the given voltage amplitude and the feedback voltage amplitude of the target disturbance quantity into the PI controller, and outputting to obtain control information M as shown in FIG. 2rAnd further synthesizing the obtained control information to obtain a three-phase voltage command input into the detection platform as
And fifthly, comparing the output three-phase voltage command serving as a modulation signal with a triangular carrier, outputting to obtain a PWM control signal, and controlling the IGBT to be switched on and off by the detection device according to the PWM signal, thereby realizing the following of the output voltage to a fixed signal.
As a second mode in this embodiment, a specific implementation procedure when selecting mode 2 is described in detail below:
firstly, inputting a detection platform disturbance mode selection parameter to be 2;
second, inputting parameters, three-phase voltage unbalance epsilonUAnd calculating the positive and negative sequence voltage amplitude given value. Assuming that the voltage is unbalanced due to the rise of the A-phase voltage, the A-phase voltage amplitude is calculated as
Wherein U is*The three-phase voltage amplitude is given when the voltage is normally output;
fig. 3 is a positive-negative sequence separation control block diagram provided in the embodiment of the present invention, and as shown in fig. 3, Park coordinate conversion is performed on three-phase voltages to obtain a positive-sequence direct-current voltage component and a negative-sequence 2-frequency multiplication alternating-current voltage component, the voltage components after coordinate conversion are filtered by a 2-frequency multiplication notch filter to obtain a positive-sequence direct-current voltage component, reverse Park conversion is performed on the positive-sequence direct-current voltage component to obtain a three-phase positive-sequence alternating-current voltage component,
and subtracting the three-phase positive sequence voltage component from the three-phase voltage to obtain a three-phase negative sequence voltage component.
Further, positive sequence voltage settings are calculated separately
And negative sequence voltage amplitude given
Thirdly, acquiring three-phase output voltage, calculating positive and negative sequence components of the three-phase output voltage of the three-phase voltage as feedback, performing Park coordinate transformation on the three-phase output voltage to obtain a positive sequence direct current voltage component and a negative sequence 2 frequency multiplication alternating current voltage component as shown in fig. 3, filtering the voltage component after coordinate transformation through a 2 frequency multiplication notch filter to obtain a positive sequence direct current voltage component, and performing reverse Park transformation on the positive sequence direct current voltage component to obtain a three-phase positive sequence alternating current voltage component; subtracting the three-phase positive sequence voltage component from the three-phase output voltage to obtain a three-phase negative sequence voltage component;
further, positive sequence voltage amplitude U is respectively calculated+And negative sequence voltage amplitude U-。
And fourthly, inputting the given amplitudes of the target disturbance quantity positive sequence voltage and the negative sequence voltage and the amplitude feedback quantities of the positive sequence voltage and the negative sequence voltage to the PI controller, wherein the positive sequence voltage component and the negative sequence voltage component are respectively controlled, as shown in FIG. 4. The PI controller outputs control information M+And M-And further synthesizing the obtained control information to obtain a three-phase voltage command input into the detection platform as
And fifthly, comparing the output three-phase voltage command serving as a modulation signal with a triangular carrier, outputting to obtain a PWM control signal, and controlling the IGBT to be switched on and off by the detection device according to the PWM signal, thereby realizing the following of the output voltage to a fixed signal.
As a third mode in the present embodiment, a specific implementation procedure when selecting mode 2 is described in detail below:
firstly, inputting a detection platform disturbance mode selection parameter to be 3;
secondly, inputting parameters, harmonic frequency n and the percentage HRUn of corresponding harmonic in fundamental wave;
amplitude of fundamental wave
Harmonic voltage amplitude is given by
Thirdly, measuring three-phase output voltage of the detection platform, and obtaining fundamental wave and nth harmonic voltage amplitude U through Fourier transform decomposition1、UnAs state feedback;
and fourthly, inputting the voltage amplitude given value and the voltage amplitude feedback quantity of the target disturbance quantity into the PI controller, wherein the fundamental wave and the harmonic wave are controlled respectively, as shown in figure 5. The PI controller outputs control information M1And MnAnd further synthesizing the obtained control information to obtain a three-phase voltage command input into the detection platform as
And fifthly, comparing the output three-phase voltage command serving as a modulation signal with a triangular carrier, outputting to obtain a PWM control signal, and controlling the IGBT to be switched on and off by the detection device according to the PWM signal, thereby realizing the following of the output voltage to a fixed signal.
In conclusion, the technical scheme of the invention can realize independent closed-loop control of each disturbance quantity, and improve the output precision of the detection platform, thereby improving the accuracy of the adaptability test of the detected device. A reliable early verification is provided for the stability of the photovoltaic and wind power equipment incorporated into the power grid.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (5)
1. A method for grid adaptive detection device injection disturbance quantity, characterized in that the method comprises:
obtaining parameters and determining a target disturbance mode;
inputting given parameters according to a target disturbance mode, and calculating to obtain three-phase voltage amplitude and frequency given signals;
there are three disturbance modes:
mode 1 is voltage ramp up, ramp down, ripple, flicker and frequency ripple;
the mode 2 is three-phase voltage unbalance, and when the mode 2 is taken as a disturbance mode for calculation, the voltage amplitude is calculated as
U*Three-phase voltage amplitude given for normal output voltage, epsilonUThe three-phase voltage unbalance degree is obtained;
mode 3 is a harmonic injection mode, and when the mode 3 is a disturbance mode for calculation, the harmonic voltage amplitude is given as
Is the fundamental wave amplitude, n is the harmonic frequency, HRUn is the percentage of the corresponding harmonic wave in the fundamental wave;
the mode 1 is used for indicating input voltage amplitude and frequency given parameters, and other parameters are input inefficiently;
the mode 2 is used for indicating input of three-phase voltage unbalance given parameters, and input of other parameters is invalid;
the mode 3 is used for indicating the input harmonic order and the corresponding harmonic content parameter, and the input of other parameters is invalid;
collecting three-phase output voltage, calculating the amplitude and frequency of the three-phase voltage, and generating a feedback signal;
inputting a given signal and a feedback signal into a disturbance quantity controller for regulation to obtain an output voltage command signal;
and comparing the voltage command signal with the triangular carrier, outputting to obtain a PWM control signal, and controlling the IGBT to be switched on and off according to the PWM signal.
2. The method of claim 1, wherein when the pattern is pattern 2, the step of calculating the magnitudes of the three-phase voltages comprises:
carrying out Park coordinate transformation on the three-phase output voltage to obtain a positive sequence direct current voltage component and a negative sequence 2 frequency multiplication alternating current voltage component;
filtering the voltage component after coordinate transformation through a 2-frequency multiplication notch filter to obtain a positive sequence direct current voltage component;
carrying out reverse Park conversion on the positive sequence direct current voltage component to obtain a three-phase positive sequence alternating current voltage component;
subtracting the three-phase positive sequence voltage component from the three-phase output voltage to obtain a three-phase negative sequence voltage component;
the magnitudes of the positive sequence voltage and the negative sequence voltage are calculated, respectively.
3. The method according to claim 2, wherein the input harmonic order and corresponding harmonic content parameters are in particular:
the harmonic order and the percentage parameter of the corresponding harmonic to the fundamental wave are input.
4. The method of claim 3, wherein the voltage command signal comprises: amplitude is combined with frequency.
5. An apparatus for grid suitability detection device injection disturbance variable, the apparatus comprising:
the acquisition unit is used for acquiring parameters and determining a target disturbance mode;
the calculation unit is used for inputting given parameters according to the target disturbance mode and calculating to obtain given signals of three-phase voltage amplitude and frequency;
the generating unit is used for acquiring three-phase output voltage, calculating the amplitude and frequency of the three-phase voltage and generating a feedback signal; there are three disturbance modes:
mode 1 is voltage ramp up, ramp down, ripple, flicker and frequency ripple;
the mode 2 is three-phase voltage unbalance, and when the mode 2 is taken as a disturbance mode for calculation, the voltage amplitude is calculated as
U*Three-phase voltage amplitude given for normal output voltage, epsilonUThe three-phase voltage unbalance degree is obtained;
mode 3 is a harmonic injection mode, and when the mode 3 is a disturbance mode for calculation, the harmonic voltage amplitude is given as
Is the fundamental wave amplitude, n is the harmonic frequency, HRUn is the percentage of the corresponding harmonic wave in the fundamental wave;
the mode 1 is used for indicating input voltage amplitude and frequency given parameters, and other parameters are input inefficiently;
the mode 2 is used for indicating input of three-phase voltage unbalance given parameters, and input of other parameters is invalid;
the mode 3 is used for indicating the input harmonic order and the corresponding harmonic content parameter, and the input of other parameters is invalid;
the input unit is used for inputting a given signal and a feedback signal into the disturbance quantity controller to be regulated to obtain an output voltage command signal;
and the control unit is used for comparing the voltage command signal with the triangular carrier wave, outputting to obtain a PWM control signal, and controlling the IGBT to be switched on and off according to the PWM signal.
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